class Demo1_DateType{
    public static void main(String[] args){
        //证书类型
        byte b = 10;
        short s = 20;
        int i = 30;
        long x = 40;
        System.out.println(b);
        System.out.println(s);
        System.out.println(i);
        System.out.println(x);

        //浮点类型
        float f = 12.3F;
        double d = 33.4;
        System.out.println(f);
        System.out.println(d);

        //字符类型
        char c = 'A';
        System.out.println(c);
    }
}